US5581140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnetic rotor and producing apparatus of the same
Assignee: Toshiba Corp
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Filing: 1993-09-02
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Granted: 1996-12-03
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Expires: 2013-09-02
Abstract
Abstract A permanent magnetic rotor is disclosed, which comprises a rotor iron core constructed of a large number of steel plates being layered, each of the steel plates peripherally defining a plurality of sector-shaped blanked holes, and sector-shaped permanent magnetic pieces inserted into the blanked holes, wherein each of the steel plates comprises an outer peripheral ring portion formed on an outer side of the blanked hole, a yoke portion formed on an inner side of the blanked hole, a connect portion formed between the outer peripheral ring portion and the yoke portion, and thin and long fitting protrusions formed at corner portions of the blanked hole in the vicinity of the connect portion, the fitting protrusions protruding to the magnet insertion hole, the fitting protrusions being fitted to the permanent magnetic piece so as to pressure and fix the permanent magnetic piece.
Inventors
- 👤 Toshihiko Futami
- 👤 Yoshiharu Shida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:24
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/276; H02K15/00; H02K15/02; H02K15/03; H02K2201/00; H02K2201/09
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
158 words
A permanent magnetic rotor, comprising: a rotor iron core constructed of a large number of steel plates being layered, each of said steel plates peripherally defining a plurality of sector-shaped blanked holes; and sector-shaped permanent magnetic pieces inserted into said blanked holes; wherein each of said steel plates comprises: an outer peripheral ring portion formed on an outer side of each of said blanked holes; a yoke portion formed on an inner side of each of said blanked holes; a connect portion formed between said outer peripheral ring portion and said yoke portion; and thin and long fitting protrusions formed at corner portions of each of said blanked holes, said fitting protrusions projecting inward from the connect portion at the corner portions towards a magnet insertion hole formed by each of said blanked holes, said fitting protrusions being fitted to each of said permanent magnetic pieces so as to pressure and fix each of said permanent magnetic pieces.
Claim 2
Dependent Claim
158 words
A permanent magnetic rotor, comprising: a rotor iron core constructed of a large number of steel plates being layered, each of said steel plates peripherally defining a plurality of sector-shaped blanked holes; and sector-shaped permanent magnetic pieces inserted into said blanked holes; wherein each of said steel plates comprises: an outer peripheral ring portion formed on an outer side of each of said blanked holes; a yoke portion formed on an inner side of each of said blanked holes; a connect portion formed between said outer peripheral ring portion and said yoke portion; and thin and long fitting protrusions formed at corner portions of each of said blanked holes, said fitting protrusions projecting inward from the connect portion at the corner portions towards a magnet insertion hole formed by each of said blanked holes, said fitting protrusions being fitted to each of said permanent magnetic pieces so as to pressure and fix each of said permanent magnetic pieces.
Claim 3
Dependent Claim
44 words
The permanent magnetic rotor as set forth in claim 1, wherein each of said permanent magnetic pieces has chamfer surfaces at inner corners thereof, and wherein each of said fitting protrusions is fitted to each of said permanent magnetic pieces at said chamfer surfaces.
Claim 4
Dependent Claim
30 words
The permanent magnetic rotor as set forth in claim 1 or 2, wherein said fitting protrusions are disposed in a direction that said steel plates are layered in predetermined intervals.
Claim 5
Dependent Claim
74 words
The permanent magnetic rotor as set forth in claim 1, wherein each of said corner portions of each of said blanked holes is formed by blanking two areas which overlap each other, the overlap portion being adapted to form a protrusion, said protrusion being disposed in a space defined by an end portion in a rotor peripheral direction of each of said permanent magnetic pieces and an inner side of said magnet insertion hole.
Claim 6
Dependent Claim
66 words
The permanent magnetic rotor as set forth in claim 1, wherein size and shape of each of said blanked holes and said fitting protrusions are designated so that each of said fitting protrusions is plastically deformed before said outer peripheral ring portion is plastically deformed by each of said permanent magnetic pieces when each of said permanent magnetic pieces is pressure-inserted into said magnet insertion hole.
Claim 7
Dependent Claim
44 words
The permanent magnetic rotor as set forth in claim 1, wherein said steel plates are integrally layered by caulked portions, a balance hole with a predetermined length being defined corresponding to a position of one of said caulked portions of said rotor iron core.
Claim 8
Dependent Claim
66 words
The permanent magnetic rotor as set forth in claim 1, wherein an axial center point on an outer side in a rotor radius direction of each of said blanked holes is disposed at an outer position than an axial center point on an inner side thereof, a sectional shape of each of said permanent magnetic pieces nearly corresponds to that of each of said blanked holes.
Claim 9
Dependent Claim
166 words
A permanent magnetic rotor, comprising: a rotor iron core constructed of a large number of steel plates being layered, each of said steel plates peripherally defining a plurality of sector-shaped blanked holes; and sector-shaped permanent magnetic pieces inserted into said blanked holes; wherein each of said steel plates comprises: an outer peripheral ring portion formed on an outer side of each of said blanked holes; a yoke portion formed on an inner side of each of said blanked holes; a connect portion formed between said outer peripheral ring portion and said yoke portion; and thin and long fitting protrusions formed at the yoke portion of each of said blanked holes in vicinity of corner portions of each of said blanked holes, said fitting protrusions projecting inward from the yoke portion towards a magnet insertion hole formed by each of said blanked holes, said fitting protrusions being fitted to each of said permanent magnetic pieces so as to pressure and fix each of said permanent magnetic pieces.
Claim 10
Dependent Claim
166 words
A permanent magnetic rotor, comprising: a rotor iron core constructed of a large number of steel plates being layered, each of said steel plates peripherally defining a plurality of sector-shaped blanked holes; and sector-shaped permanent magnetic pieces inserted into said blanked holes; wherein each of said steel plates comprises: an outer peripheral ring portion formed on an outer side of each of said blanked holes; a yoke portion formed on an inner side of each of said blanked holes; a connect portion formed between said outer peripheral ring portion and said yoke portion; and thin and long fitting protrusions formed at the yoke portion of each of said blanked holes in vicinity of corner portions of each of said blanked holes, said fitting protrusions projecting inward from the yoke portion towards a magnet insertion hole formed by each of said blanked holes, said fitting protrusions being fitted to each of said permanent magnetic pieces so as to pressure and fix each of said permanent magnetic pieces.
Claim 11
Dependent Claim
43 words
The permanent magnetic rotor as set forth in claim 8, wherein: each of said permanent magnetic pieces has chamfer surfaces at inner corners thereof, and each of said fitting protrusions is fitted to each of said permanent magnetic pieces at said chamfer surfaces.
Claim 12
Dependent Claim
30 words
The permanent magnetic rotor as set forth in claim 8 or 9, wherein said fitting protrusions are disposed in a direction that said steel plates are layered in predetermined intervals.
Claim 13
Dependent Claim
74 words
The permanent magnetic rotor as set forth in claim 8, wherein each of said corner portions of each of said blanked holes is formed by blanking two areas which overlap each other, the overlap portion being adapted to form a protrusion, said protrusion being disposed in a space defined by an end portion in a rotor peripheral direction of each of said permanent magnetic pieces and an inner side of said magnet insertion hole.
Claim 14
Dependent Claim
67 words
The permanent magnetic rotor as set forth in claim 8, wherein a size and shape of each of said blanked holes and said fitting protrusions are designated so that each of said fitting protrusions is plastically deformed before said outer peripheral ring portion is plastically deformed by each of said permanent magnetic pieces when each of said permanent magnetic pieces is pressure-inserted into said magnet insertion hole.
Claim 15
Dependent Claim
44 words
The permanent magnetic rotor as set forth in claim 8, wherein said steel plates are integrally layered by caulked portions, a balance hole with a predetermined length being defined corresponding to a position of one of said caulked portions of said rotor iron core.
Claim 16
Dependent Claim
66 words
The permanent magnetic rotor as set forth in claim 8, wherein an axial center point on an outer side in a rotor radius direction of each of said blanked holes is disposed at an outer position than an axial center point on an inner side thereof, a sectional shape of each of said permanent magnetic pieces nearly corresponds to that of each of said blanked holes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |